Periscope and like instrument casing.



J. w. FRENCH.

PERISCOPE AND LIKE INSTRUMENT CASING.

APPLICATION FILED NOV. 12. 19l8.

1,298,632. Patented Mar. 25, 1919.

FIG

kl a 9* a 1V Q A 17101911101. 115177165 74561" lie/fill! Jrwn/ UNITED $TATES FATE @FFICE.

JAMES WEIR FRENCH, 0F GLASGOW, SCOTLAND, ASSIGNOR TO BARR AND STROUD LIMITED, OF ANNIESLAND, GLASGOW, SCOTLAND.

PEEISCOPE AND LIKE INSTRUMENT CASING.

To all whom it may concern:

Be it known that I, JAMES WEIR FRENCH, a subject of the King of Great Britain and Ireland, and a resident of Glasgow, Scotland, have invented new and useful Improvements in or Connected with Periscope and like Instrument Casings, of which the following is a specification.

This invention relates to periscope and like instrument casings of the type composed of tubular casing parts connected together co-axially, which, as far as possible, should be devoid of external surface projections, capable of excluding water under considerable pressure, formed so as to insure that the parts when assembled shall conform to some predetermined length within small limits while maintaining the same orientation and permitting in some cases access to be obtained from the exterior to mechanism contained within the casing.

The improvements according to this invention relate to, connecting casing parts together, sealing the joints of the casing, and the provision of apertures for giving access to the interior of the casing.

In connecting two tubular casing parts together the exteriors of which are circular in cross section, one. hereinafter referred to for convenience as the first or lower part, may be receive the lower end of the second or upper part which is formed to present a shoulder conforming to the faced end'of the lower part, or the lowerpart may be bored and formed to present a shoulder at the base of the bore against which the faced end of the upper part is adapted to bear. For drawing the two parts axially together longitudinal draw bars are provided. each of which at its foot or lower end is secured in the interior of. say. the lower part. for example. by being formed or fitted with means arranged to enter into engagement with the upper surface of an abutment in the interior of the lower part, which abutment may be pro vided by recessing, or by fitting a permanently fixed or removable part therein, and longitudinal passages are formed in the walls of'the upper part. which extend to recesses formed in the exterior of the upper part, through which the bars are adapted to extend. \Vhen the two parts are assembled, theheads or. tops of the bars, which are safiiienuy long to project into the externa- Specification of Letters Patent.

faced at its upper end and bored to' Patented Mar. 25, 1919.

Application filed November 12, 1918. Serial No. 262,233.

recesses, are fitted with tension means, such as nuts or keys, which on being tightened while bearing upon the bases of the recesses, cause the upper and lower parts to be axially drawn together with their complementary face and shoulder in contact. The draw bars may be made removable from the lower part, and, when this is done provision may be made for temporarily locking or supporting them in position before the parts are assembled. The overlapping parts of the casing and the longitudinal passages may be of considerable or very considerable length.

Some examples of construction according to this invention will now be described with reference to the accompanying drawing. in which Figure 1 is a vertical sectional elevation showing casing parts connected together, and Fig. 2 is a vertical sectional elevation of the casing parts showing an aperture for giving access to the, interior of the casing.

Fig. 3 is a vertical sectional elevation, and Fig. 4 is a sectional view taken about the line X Y of Fig. 3, showing casing parts connected together.

In the drawings, A designates the first or lower part and B the second or upper part of two tubular casing partswhich are to be connected together.

In the form of construction shown at Fig. 1, four draw bars C are provided, which in use are arranged about a circle concentric to the axis of the casing parts and at equal distances apart. The foot end of the bars are secured in complementary pairs to two separate segmental shoes D D. In horizontal section each of the segmental shoes is less thanhalf a circle. \Vithin the lower part A, at a position beneath that to which, say, the end of the upper part 13 extends, an internal recess is formed, presenting a shoulder at its top to form an abutment. the plane of which, for instance, is normal to the axis of the casing. The peripheries and upper edges of the segmental shoes D, D are made to conform to this recess, so that, with the draw bars C attached to D D, the shoes mav be introduced into the lower part A and fitted to rest therein with their upper edges against the top of the recess. For retaining the shoes in this position, a flanged ring E. adapted to fit between the shoes, may be inserted and retained in position by screws passing through its flange screwed into the *shoessD D The Wall about the lower end of the upper part B may, as shown be of such: thickness that the longitudinal passages are formed: to extend from the base thereof. The interior portion B of the upper part B inztheregioniof the top end of the passages is thickenedand exter-- nalrecesses Fare formedwtherem. case as shown where nuts are provlded for tightening the draw barsyeach external 're-' cess F may be formed of suficient size to accommodate a; nut and spannerh'ead for tighteningdt. 'Intervening between any of these external recesses, apertures G, see Fi g. 2, maybe formed"v to extend ithroughfthe Wall. For instance, in the, case." where two transmission rods" for operating working parts ofthe'instruinent, one 'of' which H only is shown arez'provided extending up-v ward in the; interior of the casingfhaving couplings at this position to, whichfvit is desirable to :have' access for connecting. or disengaging .the couplings, two apertures such as G may beformed on diametrical of- -theexternal "recesses 4 F, screw plugs G being" provided for" closing In assembling the two. parts" of a construe ti'on'ofthis character, with the. draw bars C opposite, sides, each .locat'edbetween; two

fi-z're'd inj position and the transmission, rods disconnected, a lubricant or other subof the lower mg into their stance-may be applied'to the portions ofxthe cas1ng,' draw4bars and long tudinal passages,

whichare to-liein' contact. fThe end of the upper partB is then inserted into, the bore part A, the draw bars C passvrespective longitudinal passages." The'nuts are applied to the bars andtightened,

' edinto the access apertures G." The external keys L, and, inwhich; the second 1.01

part Bfis bored to receive the end of the recesses Fandsockets of the plugs Gwhich are disposed abo-utthe same transverse plane are then filled in with a sealing lubricant or substance and asle'eve K applied which extends over and coversthe-sockets. and reces'ses. jThisosleeve'iK' may be thin and be brought to bear against a: shoulder formed on the exterior of the upper part B. and be lockedfagainst endwise displacement, for instance, by means of a screw.

' In {the form of construction shown atFigs.

Sand 4, two draw-bars C are; provided; arranged' 'diametrica'lly; on apposite sides of the casing, which a-reito'betig tened tapered upper first or lower; part A,;tw o diametrical holes f or internal recesses'may be formed in the lowerpart A; at a position covered by the lower end of the upperpart B, to receive studs projecting from -the';foot or lower endof eachof the draw bars C and for retaining the bars C when inserted 'inposition i a s' ng ring may bra-[provided which'passes In the' these apertures.

plete-tlie joint.

v v and'the transmission rods H coupledafter which the plugsG 'a-re 1nsert-.

' of the other through the bars.- Inthis case instead of external recesses being formed in the upper part comm unicatinggwtithz the; upper endfitof the longitudinal passages, two transverse holes F may be formed in the walls thereof, one for each passage, each transverse hole being contained within the wall of the upper part Biat-a distance from the aflXiStlthQrQQf,

tangential to the casing and parallel to one another. These holes may be c rcular, and each is intersected by the top of 1ts draw bar C which projects upward-across itLQ Inthis part of the: draw* ,bar"Gt, iagztransverse "slot is ,formed' into which thexzvtedge shaped: L

is *adapted to be forced: ien'dwise, for; ins stancey'bymeans of a screwed plugl from one: en -1hr the transverse hole; and "removed by being driven-outby pin inserted; at the other, The screwed plug also acts}, to, close thehole and "a sQITQWed'plug may bepro, vided Enclosing-the opposite endZ- In this form Fof construction the endgface; I of jthe lower Y part A is forced endwise against a; shoulder formed at; the top end" ofthe-pbore in jth'e'npper part B'Twhich; is-boredto' tightly over the upper endof the lower: par-t.

After the-g-plugs. have been screwed in'; the sockets remaining" may be filled "inf as in other case; and-a sleev e' lfi'japplie'cl-g com-- 1. Periscope and dike"instrument; casings composed of tubu-lar parts, havingtwo -tubularcasing parts, a first part and a second part, connected together co-aXially,-"afaced surface at the 'end'f'of the first part', a shoul der on thesecond part at a distance from and'presentedjtoward its end'conforming to g the faced surface end of the "first part, one of the parts beingbp'red to receiv'e'tl'ie end of the "other part soth'at the faced surface end may'bear-agai'nst the "shoulder, longitudinal draw bars each securedat its foot e idin the interiorof the first part," longitudinal passages formed in the-walls of-the second part through which the draw bars are a da pted'to extend, recesses/formed in the "exterior" of the, second part" to whichthepassages extendand 'into which thelhleads of the "draw bars are: adaptedto project, and tension means "for fapplication" at" the heads of the rs, o

for the purposes set forth.

the new Q fec awattle 2.1 Periscope and like-instrument casings together coeaxiall'y, afabed tee interior of the first part and temporarily supporting them in position, longitudinal passages formed in the walls of the second part through which the draw bars are adapted to extend, recesses formed in the exterior of the second part to which the passages extend and into which the heads of the draw bars are adapted to project, and tension means at the heads of the bars, for the purposes set forth.

3. Periscope and like instrument casings composed of tubular parts, having two tubular casing parts, a first part and a second part, connected together co-axially, a faced surface at the end of the first part bored to receive the end of the second part, a shoulder on the exterior of the second part at a distance from and presented toward its end conforming to the faced surface end of the first part, longitudinal draw bars, means for securing the foot end of each draw bar in the interior of the first part, longitudinal passages formed in the walls of the second part through which the draw bars are adapted to extend, recesses formed in the exterior of the second part to which the passages extend and into which the heads of the draw. bars are adapted to project, and tension means at the heads of the bars, for the purposes set forth.

4. Periscope and like instrument casings composed of tubular parts, having two tubular casing parts, a first part and a second part, connected together co-axially, a faced surface at the end of the first part, a shoulder on the second part at a distance from and presented toward its end conforming to the faced surface end of the first part, one of the parts being bored to receive the end of the other part so that the faced surface end may bear against the shoulder, longitudinal draw bars, means for securing the foot end of each draw bar in the interior of the first part, longitudinal passages formed in the walls of the second part through which the draw bars are adapted to extend, recesses formed in the exterior of the second part to which the passages extend and into which the heads of the draw bars are adapted to project, tension means at the heads of the bars and means for covering the recesses, for the purposes set forth.

5. Periscope and like instrument casings composed of tubular parts, having two tubular casing parts, a first part and a second part connected together co-axially, the first part bored to receive the end of the second part, a faced surface at the end of the first part, a shoulder on the exterior of the second part at a distance from and presented toward its end conforming to the faced surface end of the first part, longitudinal draw bars, shoes to which the foot end of the draw bars are secured, an abutment in the interior of the first part for the shoes to engage with, means for temporarily locking the shoes in position, longitudinal passages formed in the walls of the second part through which the draw bars are adapted to extend, recesses formed in the exterior of the second part to which the passages extend and into which the heads of the draw bars are adapted to project, and tension means for application at the heads of the bars, for the purposes set forth.

6. Periscope and like instrument casings composed of tubular parts, having two tubular casing parts, a first part and a second part connected together co-axially, the first part bored to receive the end of the second part, a faced surface at the end of the first part, a shoulder on the exterior of the second part at a distance from and presented toward its end conforming to the faced sur face end of the first part, longitudinal draw bars, segmental shoes to which the foot end of the draw bars are secured, an abutment in the interior of the first part for the shoes to engage with, a ring to fit between the shoes, longitudinal passages formed in the walls of the second part through which the draw bars are adapted to extend, recesses formed in the exterior of the second part to which the passages extend and into which the heads of the draw bars are adapted to roject, tension means for application at the iieads of the bars, and means for covering the recesses, for the purposes set forth.

JAMES WEIR FRENCH.

Copies of thispatent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. 0. 

